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Related Experiment Videos

Multiprocess lateralisation in dyslexia.

David Boles1, Tanya Turan

  • 1Department of Psychology, University of Alabama, Tuscaloosa 35487, USA. bdoles@bama.ua.edu

Laterality
|October 30, 2004
PubMed
Summary

Dyslexic readers show unusual brain lateralization for visual-spatial tasks, performing quantitative processing in the left hemisphere instead of the right. This suggests parietal lobe dysfunction in dyslexia.

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Area of Science:

  • Neuroscience
  • Cognitive Psychology
  • Developmental Psychology

Background:

  • Previous research on dyslexia focused on verbal measures, yielding inconsistent findings on functional brain asymmetry.
  • Behavioral asymmetries in dyslexia have not been consistently supported by prior studies, particularly those emphasizing verbal tasks.

Purpose of the Study:

  • To investigate functional brain asymmetry in adult dyslexic readers using a multiprocess approach.
  • To explore differences in visual-spatial quantitative processing lateralization between dyslexic and normal readers.

Main Methods:

  • Employed a multiprocess approach with a sample of adult dyslexic readers.
  • Assessed behavioral asymmetries using a bargraph recognition task, a visual-spatial quantitative task.

Main Results:

  • Identified an unusual pattern of lateralization for bargraph recognition in dyslexic readers.
  • Dyslexic readers exhibited left hemisphere processing for spatial quantitative tasks, contrasting with the typical right hemisphere pattern in normal readers.

Conclusions:

  • Findings suggest parietal lobe dysfunction in dyslexia, specifically implicating the angular gyrus.
  • The observed right-to-left shift in function may be linked to reported left-to-right shifts in brain tissue in dyslexic individuals.

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